I can implement new features to your existing code written in VB.NET/C# and using Microsoft.NET Framework. I have a lot of experience understanding legacy code, and then implementing new features according to client's or business requirements using best practices.
I have worked on many such legacy systems where expert software expertise was required to implement new features in legacy systems where no documentation of any kind was available. Based on my experience and skillset, I have successfully delivered and added features to legacy systems.